Since this is freshman-level "think, don't believe", here's an equally valid counterargument at roughly the same level. In Heinrich's book "The Secret of our Success" on cumulative cultural evolution, he gives an example of pre-Columbus American cultures whose diet was based on bitter manioc (a.k.a. cassava). Like the name suggests, in its raw form it's too bitter to eat, but these cultures evolved a set of tradition…
"Think for yourself" is humanity's adaptation of forager ants[0]. Sure, many will be lost, but we need those people that hunt for novelty because it eventually benefits everyone else. You could even think of historical figures that advanced society as the forager ants of our culture. I'm not sure what the benefit would be if everyone chose to be one, though. The hive mind is an interesting phenomenon, it seems that t…
Forager ants, Galileos and people who just boil their cassava are the explorers I guess, and probably humanity needs a proportion of them because every now and then one of them will find a herb with amazing medicinal properties or something. That may be an evolutionary advantage even if 90% of explorers die eating something poisonous before they've found anything useful.
Maybe startups are today's explorers? Being very generous to VC-backed startups, possibly 90% of them fail, but on average they're still a good investment - just ask Paul Graham.
I'm less sure about the full veil as an example because there's a lot of debate about what exactly the Prophet's instruction for women to cover their head meant; it's certainly interpreted differently across different Islamic cultures (a hijab is not an abaya is not a burqa etc.); and covering of the face as opposed to the hair is definitely not universal in Islam (the headscarf/hijab leaves the face free for example).